Linear vs logarithmic scales. 1  Human hearing is better measured on a logarithmic scale than a linear scale. 2  On a linear scale, a change between two values is perceived on the basis of the difference between the values.  On a logarithmic scale, a change between two values is perceived on the basis of the ratio of the two values.
Antimony has been known since ancient times. It is sometimes found free in nature, but is usually obtained from the ores stibnite (Sb 2 S 3) and valentinite (Sb 2 O 3). Nicolas Lemery, lÃ©mery A french, chemist was the first person to scientifically study antimony and its. compounds
Strontium (atomic number 38, symbol Sr) is an alkaline earth metal that is commercially available. Its chemical and physical properties are similar to that of elements such as barium and calcium. It was discovered in 1790 by the Scottish chemist William Cruickshank and the physician and chemist Adair Crawford.